diff --git a/tools/debugserver/source/MacOSX/arm/DNBArchImpl.cpp b/tools/debugserver/source/MacOSX/arm/DNBArchImpl.cpp
index 90cc256..0bac227 100644
--- a/tools/debugserver/source/MacOSX/arm/DNBArchImpl.cpp
+++ b/tools/debugserver/source/MacOSX/arm/DNBArchImpl.cpp
@@ -105,6 +105,7 @@
 #define MNEMONIC_STRING_SIZE 32
 #define OPERAND_STRING_SIZE 128
 
+#if !defined(__arm64__) && !defined(__aarch64__)
 // Returns true if the first 16 bit opcode of a thumb instruction indicates
 // the instruction will be a 32 bit thumb opcode
 static bool IsThumb32Opcode(uint16_t opcode) {
@@ -112,6 +113,7 @@
     return true;
   return false;
 }
+#endif
 
 void DNBArchMachARM::Initialize() {
   DNBArchPluginInfo arch_plugin_info = {
@@ -315,6 +317,7 @@
   return kret;
 }
 
+#if 0
 static void DumpDBGState(const DNBArchMachARM::DBG &dbg) {
   uint32_t i = 0;
   for (i = 0; i < 16; i++) {
@@ -324,6 +327,7 @@
                      dbg.__wcr[i]);
   }
 }
+#endif
 
 kern_return_t DNBArchMachARM::GetDBGState(bool force) {
   int set = e_regSetDBG;